Auction: 14025 - The Philatelic Collector's Series sale
Lot: 1432
Swaziland
1961 Decimal Surcharges
50c. Type III on 5/- deep lilac and slate-black plate block of four, fresh unmounted mint. The sole such block recorded and one of the great rarities of Elizabethan philately. P.F.S.A. Certificate (1984). S.G. 74. Photo
Note:
Only six sheets were overprinted
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Estimate
£12,000 to £15,000